/*
 * This file is part of LangMan.
 *
 * LangMan is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * LangMan is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with LangMan.  If not, see <http://www.gnu.org/licenses/>.
 */

package langman.business.actions.key;

import com.google.common.base.Strings;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.ReadOnlyBooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.collections.ObservableMap;
import langman.Utils;
import langman.business.actions.common.Action;
import langman.business.actions.common.ActionTypes;
import langman.business.data.TranslationException;
import langman.business.data.TranslationService;
import langman.business.data.model.Category;
import langman.business.data.model.Key;
import langman.business.data.model.Language;
import langman.gui.tree.CategoryItem;
import langman.gui.tree.TreeItemSelectionService;
import langman.util.doping.Inject;
import langman.util.doping.SingletonBean;
import org.controlsfx.dialog.Dialogs;

import java.util.ArrayList;
import java.util.List;

@SingletonBean
public class AddKeyAction implements Action {

    private final TranslationService translationService;
    private final TreeItemSelectionService selectionService;

    private final BooleanProperty possible = new SimpleBooleanProperty();

    @Inject
    public AddKeyAction(TranslationService translationService, TreeItemSelectionService selectionService) {
        this.translationService = translationService;
        this.selectionService = selectionService;

        selectionService.selectedItemProperty().addListener((observableValue, treeItem, newValue) -> possible.set(newValue instanceof CategoryItem));
    }

    @Override
    public ReadOnlyBooleanProperty possibleProperty() {
        return possible;
    }

    @Override
    public void perform() {
        String keyName = Dialogs.create().lightweight().message("Enter key name!").showTextInput(determineNextKeyName());

        if (Strings.isNullOrEmpty(keyName)) {
            return;
        }

        Key key;
        try {
            key = translationService.ensureUniqueKey(keyName);
        } catch (TranslationException e) {
            Dialogs.create().lightweight().message(e.getMessage()).showError();
            return;
        }

        Language referenceLanguage = translationService.getReferenceLanguage();
        String referenceTranslation = Dialogs.create().lightweight().message("Enter " + referenceLanguage.getName() + " translation!").showTextInput();

        if (Strings.isNullOrEmpty(referenceTranslation)) {
            return;
        }

        try {
            key.translate(referenceLanguage, referenceTranslation);
        } catch (TranslationException e) {
            Dialogs.create().lightweight().message("Setting of translation failed. Reason: " + e.getMessage()).showError();
        }
        selectionService.getSelectedCategory().addKey(key);
    }

    @Override
    public ActionTypes getActionType() {
        return ActionTypes.AddKey;
    }

    @SuppressWarnings("StringConcatenationMissingWhitespace")
    private String determineNextKeyName() {
        Category selectedCategory = selectionService.getSelectedCategory();
        ObservableMap<String, Key> keysUnmodifiable = selectedCategory.getKeysUnmodifiable();
        List<Key> keys = new ArrayList<>(keysUnmodifiable.values());

        if (keys.isEmpty()) {
            return "";
        }

        Key lastKey = keys.get(keys.size() - 1);
        String keyName = lastKey.getKey();
        return Utils.getNextKey(keyName);
    }
}
